holy beast god, great gater, aim for the weakest heroine!

Gaither Mermaid Mizusaka love is attacked by an Insider Star during patient rehabilitation! The destructive animal Clargen appears this time even if it steals the patient's eyes and transforms, somehow taking off the crisis! i'm not the one who can defeat you alone. Marmaid escapes patients to inform his friends of this crisis, but after special attacks such as jellyfish tentacles and sea snake bites of clarugen, even fighters gather! In addition, the patient who came back to Marmaid was Gadia, commander of the insider! He will hear and destroy the gigantic robot "Big Beast God" of Great Gather! It's enough for one person to break his mouth. That's why the weakest Gather Mermaid was targeted! Is it possible for Mermaid to protect the Great Beast God, his companions, and the earth? [BAD END]